The Preliminary Study Of High-Speed Pulse Induction Traction System

When the high-speed wheel train and maglev train running at more than400km/h, air resistance accounts for over80%of the total resistance which is not economical. For higher speed, scholars have put forward the design of pipeline transportation many years ago, which can reduce the pipeline pressure and the air resistance to realize ultra-high-speed economic operation, Now the research is rarely. This paper as the high-speed train simulation test bench for short distance to accelerate simulation model cars to high speed and ultra-high-speed traction pipeline transportation system for target, studies the pulse induction traction system based on reconnection electromagnetic drive.Firstly, a three-dimensional finite element simulation model of single-stage reconnection electromagnetic drive is established by Maxwell3D electromagnetic field analysis software. The eddy field and transient field of single-stage is simulated, The result reflects the distribution of coil transient magnetic, the change of eddy currents and the distribution of energy in the aluminum plate in single-stage reconnection electromagnetic driving system, gives the relationship of the changing of the projectile velocity and force with time.Then, the coupled motion equation of the multi-stage reconnection electromagnetic drive is derived. The equation describes the relationship of mutual inductance between the coils and aluminum plate in detail, reflects the force of the projectile in the multistage system. The simulation model of three-stage reconnection electromagnetic drive is established. Through multi-level transient field analysis under different initial velocity, expounds the motion characteristics of the projectile in the multistage system.Through a multi-level transient field analysis under different structures, gives the hoop scheme that can improve system efficiency and reduce the coupling magnetic field of coils. The paper considers the relationship of the coil inductance gradient location, projectile velocity and current rise time for the best driving and reverse eddy current of the projectile and reverse current of the coils can be used to increase the driving force.Finally, the principle prototype experimental platform is established, including the design of principle prototype mechanical structure, main circuit, human machine interface (HMI), control testing procedures and optical coupling drive circuit. The experimental results are obtained.Comprehensive analysis:the high-speed traction scheme of reconnection electro-magnetic drive can use the way of parallel unit triggers and multistage continuous drive to accelerate massive object to high-speed. This scheme is suitable for accelerating model car to high-speed in short distance. But the scheme has the traction force ripple, high acceleration. If the scheme is used for pipeline transport ultra-high speed traction system, the buffer device is needed to consider.